Early timing of low-dose dexamethasone decreases inflammation in a murine model of eosinophilic airway disease.

Abstract:

CONCLUSION:A very low dose of dexamethasone (DEX) was as equally as sufficient as a pharmacological dose to decrease eosinophil inflammation in airways and bone marrow. The timing of DEX treatment in relation to allergen challenge was strongly decisive for the outcome of the inflammatory response. OBJECTIVES:We aimed to study compartmental allergic airway inflammatory responses to classic pharmacological and also extremely low physiological DEX dosage, given at different time points close to allergen challenge in a murine model. MATERIALS AND METHODS:Ovalbumin-sensitized BALB/c-mice were exposed to intra-nasal ovalbumin. DEX was given i.p. as 1 microg/kg low-dose or 500 microg/kg pharmacological single-dose 2 h before, immediately before or 7 h after each of three challenges. Inflammatory cells were evaluated in bronchoalveolar lavage (BAL), lungs, nasal mucosa, and bone marrow. RESULTS:Groups treated with low-dose DEX decreased eosinophilia in BAL to the same extent as the pharmacological dose, but only when administered before challenge. The most prominent decrease of eosinophils in BAL was seen in mice treated with the low dose 2 h before challenge. A similar response pattern as in BAL eosinophilia was detected in lung histopathology. DEX treatments had no obvious effects on inflammation in nasal mucosa.

journal_name

Acta Otolaryngol

journal_title

Acta oto-laryngologica

authors

Georén SK,Tcacencu I,Wikström AC,Stierna P

doi

10.1080/00016480802126561

subject

Has Abstract

pub_date

2009-02-01 00:00:00

pages

182-9

issue

2

eissn

0001-6489

issn

1651-2251

pii

794196917

journal_volume

129

pub_type

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